Which of the following statement is correct about a solution contains 0.2 M NaH PO, and 0.5 M H;PO,? OThis is NOT a buffer solution. O Adding 0.01 mol NaOH to the solution will slightly decrease the pH. O Adding 0.01 mol NaOH to the solution will slightlyincrease the pH. O The solution pH is more than pk, of H3PO4 O The solution pH is equal to the pk, of H3PO4

Which of the following statement is correct about a solution contains 0.2 M NaH PO, and 0.5 M H;PO,? OThis is NOT a buffer solution. O Adding 0.01 mol NaOH to the solution will slightly decrease the pH. O Adding 0.01 mol NaOH to the solution will slightlyincrease the pH. O The solution pH is more than pk, of H3PO4 O The solution pH is equal to the pk, of H3PO4

Chemistry: Principles and Reactions

8th Edition

ISBN:9781305079373

Author:William L. Masterton, Cecile N. Hurley

Publisher:William L. Masterton, Cecile N. Hurley

Chapter14: Equilibria In Acid-base Solutions

Section: Chapter Questions

Problem 72QAP: Four grams of a monoprotic weak acid are dissolved in water to make 250.0 mL of solution with a pH...

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A buffer solution is prepared by adding 0.125 mol ammonium chloride to 500. mL of 0.500-M aqueous ammonia. Calculate the pH of the buffer. If 0.0100 mol HCl gas is bubbled into 500. mL buffer and all of the gas dissolves, calculate the new pH of the solution.
Four grams of a monoprotic weak acid are dissolved in water to make 250.0 mL of solution with a pH of 2.56. The solution is divided into two equal parts, A and B. Solution A is titrated with strong base to its equivalence point. Solution B is added to solution A after solution A is neutralized. The pH of the resulting solution is 4.26. What is the molar mass of the acid?
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A monoprotic organic acid that has a molar mass of 176.1 g/mol is synthesized. Unfortunately, the acid produced is not completely pure. In addition, it is not soluble in water. A chemist weighs a 1.8451-g sample of the impure acid and adds it to 100.0 mL of 0.1050 M NaOH. The acid is soluble in the NaOH solution and reacts to consume most of the NaOH. The amount of excess NaOH is determined by titration: It takes 3.28 mL of 0.0970 M HCl to neutralize the excess NaOH. What is the purity of the original acid, in percent?
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